Double Cicada Brood 2024 Wikipedia Deutsch. Billions of cicadas are set to surface this spring as two different broods — one that appears every 13 years, and another every 17 years — emerge simultaneously. The northern illinois brood spends 17 years underground before surfacing and is known as brood xiii, while the great southern brood, or brood xix, lives.
This event is as uncommon as it. The cidada project at the university of connecticut/the washington post.